Surface discharge type air cleaning device

ABSTRACT

A surface discharge air cleaning device includes an insulating dielectric body, a discharge electrode formed at the upper surface of the insulating dielectric body, and a ground electrode formed at the lower surface of the insulating dielectric body, the discharge electrode being formed of a closed pattern and at least one non-pattern part, at which the electrode is not formed being disposed in the closed pattern, therefore a uniform and stable plasma formation is accomplished, and the number of hydroxyl radicals and negative ions is increased while the amount of ozone is decreased.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a surface discharge type air cleaningdevice mounted in an air conditioner for cleaning air, and, moreparticularly, to a surface discharge type air cleaning device that iscapable of increasing generation of negative ions and hydroxyl (OH)radicals while decreasing generation of ozone, which is toxic to humans,thereby improving noxious gas sterilizing efficiency and air cleaningefficiency.

2. Description of the Related Art

Generally, a surface discharge type air cleaning device adopts a surfacedischarge plasma chemical processing method. Specifically, the surfacedischarge type air cleaning device is a ceramic-based high frequencydischarge type air cleaning device that is capable of generating a largenumber of hydroxyl radicals and a large amount of ozone through theformation of a strong plasma area on the surface of an element andprocessing noxious gases through the use of the generated hydroxylradicals and ozone.

FIG. 1 is a plan view showing a conventional surface discharge type aircleaning device, and FIG. 2 is a cross-sectional view of theconventional surface discharge type air cleaning device seen from lineA-A of FIG. 1.

As shown in FIGS. 1 and 2, the conventional surface discharge type aircleaning device comprises: an insulating dielectric body 10, which iscomposed of two rectangular sheets attached to each other while beingdisposed in surface contact with each other; a discharge electrode 12disposed on the upper surface of the insulating dielectric body 10; anda ground electrode 14 disposed between the two rectangular sheets of theinsulating dielectric body 10. On the upper surface of the insulatingdielectric body 10 is applied a coating layer 16 for covering thedischarge electrode 12 such that the discharge electrode 12 is notdirectly exposed to the atmosphere.

Generally, the insulating dielectric body 10 is made of a ceramicmaterial. The discharge electrode 12 is connected to one terminal of apower source supply unit, and the ground electrode 14 is connected tothe other terminal of the power source supply unit, such that the powersource is supplied to not only the discharge electrode 12 but also theground electrode 14. An alternating current power source is used as thepower source.

The discharge electrode 12 comprises: three main electrodes 12 a, whichare arranged in parallel with one another; and subsidiary electrodes 12b protruding from the main electrodes 12 a, each of the subsidiaryelectrodes 12 b having a pointed end. The ground electrode 14 comprises:two branched ground electrodes 14 a, which are arranged in parallel witheach other and disposed opposite to the subsidiary electrodes 12 b.

When a power source having a voltage higher than onset voltage isapplied to the discharge electrode 12 and the ground electrode 14 of theconventional surface discharge type air cleaning device with theabove-stated construction, a dielectric breakdown phenomenon occursbetween the discharge electrode 12 and the ground electrode 14. As aresult, a discharge phenomenon occurs on the surface of the insulatingdielectric body 10, as shown in FIG. 3, and therefore, a strong plasmaarea is formed on the surface of the insulating dielectric body 10.

When the plasma is discharged as described above, a conductive path,which is called a streamer, is formed on the surface of the insulatingdielectric body 10, and a large number of high-energy electrons aregenerated through the streamer. The high-energy electrons react withgases surrounding the high-energy electrons due to electron collision.As a result, a large amount of ozone and a large number of hydroxylradicals and negative ions are generated.

The generated ozone, hydroxyl radicals, and negative ions oxidize anddecompose pollutants, such as noxious gases contained in air, to cleanthe air.

As described above, the conventional surface discharge type air cleaningdevice performs discharge through the entire surface of the insulatingdielectric body 10, and therefore, the onset voltage of the conventionalsurface discharge type air cleaning device is lower than that of acorona discharge type air cleaning device. Consequently, powerconsumption is low, and noise generated from the conventional surfacedischarge type air cleaning device is small, and therefore, air isefficiently cleaned by the conventional surface discharge type aircleaning device even when the conventional surface discharge type aircleaning device is used in a small space.

In the conventional surface discharge type air cleaning device, however,the discharge electrode 12 is disposed on the upper surface of theinsulating dielectric body 10, i.e., the pattern of the dischargeelectrode 12 is formed on the upper surface of the insulating dielectricbody 10 in an embossed structure. As a result, there is a limit inlowering the onset voltage and input energy necessary to causedischarge. Consequently, the number of hydroxyl radicals and negativeions, which are generated when the voltage is low, is decreased, and theamount of ozone, which is toxic to humans, is increased. In addition,power consumption is increased.

Specifically, electrical charge concentration is increased at the endpart E of the discharge electrode 12, as shown in FIG. 3. Consequently,it is required that the onset voltage and the input energy be raised inorder to accomplish uniform generation distribution of streamerthroughout the entire region of the dielectric body. Especially, thermalstress is partially increased at the end part E of the dischargeelectrode 12, and therefore, gases surrounding the discharge electrode12 are heated. As a result, the amount of ozone generated is increased.On the other hand, the number of hydroxyl radicals and negative ions isdecreased. Also, partial deterioration of the electrode occurs rapidlydue to partial increase of thermal stress, and therefore, the servicelife of the surface discharge type air cleaning device is shortened, anddischarge safety is also lowered. Consequently, air cleaning efficiencyis decreased.

Furthermore, the insulating dielectric body 10 of the conventionalsurface discharge type air cleaning device is composed of two sheets,between which the ground electrode 14 is disposed. Consequently, thestructure of the conventional surface discharge type air cleaning deviceis complicated, and therefore, manufacturing costs of the conventionalsurface discharge type air cleaning device are increased.

SUMMARY OF THE INVENTION

Therefore, the present invention has been made in view of the aboveproblems, and it is an object of the present invention to provide asurface discharge type air cleaning device having a discharge electrodewhose pattern is formed in a depressed structure to lower onset voltageand input energy and to accomplish entirely uniform and stable plasmaformation, thereby increasing the generated number of hydroxyl radicalsand negative ions, which sterilize and decompose noxious gases, whiledecreasing the generated amount of ozone, which is toxic to humans,preventing decrease of the service life of the surface discharge typeair cleaning device due to partial deterioration of the dischargeelectrode, and reducing power consumption.

In accordance with the present invention, the above and other objectscan be accomplished by the provision of a surface discharge type aircleaning device comprising: an insulating dielectric body formed in theshape of a sheet; a discharge electrode formed at the upper surface ofthe insulating dielectric body; and a ground electrode formed at thelower surface of the insulating dielectric body, wherein the dischargeelectrode is formed of a closed pattern having a predetermined area onthe upper surface of the insulating dielectric body, and the dischargeelectrode has at least one non-pattern part disposed in a part where thepattern is formed, the electrode being not formed at the at least onenon-pattern part.

Preferably, the pattern of the discharge electrode is formed in theshape of a rectangular frame, and the ground electrode is formed of asingle rectangular pattern.

Preferably, the frame area of the pattern of the discharge electrode isgreater than that of the pattern of the ground electrode.

Preferably, the at least one non-pattern part comprises a plurality ofnon-pattern parts extending in the longitudinal direction of the patternof the discharge electrode while being arranged in parallel with oneanother. Each of the non-pattern parts comprises: a linear partextending in the longitudinal direction of the pattern of the dischargeelectrode; and a plurality of circular parts formed on the linear partat a predetermined interval, the diameter of each of the circular partsbeing greater than the width of the linear part.

Preferably, the discharge electrode has a plurality of pointed ends,which are protruded from opposite sides of the pattern part about thenon-pattern part toward each other, and the pointed ends are formed inthe shape of a triangle and uniformly protruded at a predeterminedinterval.

Preferably, the air cleaning device further comprises: protective filmsapplied to the upper and lower surfaces of the insulating dielectricbody for protecting the discharge electrode and the ground electrode,respectively, and the discharge electrode and the ground electrode areprovided with terminal parts, which are exposed outside the protectivefilms and connected to an external circuit, respectively.

According to the present invention, the pattern of the dischargeelectrode is formed in the depressed structure. Consequently, it ispossible to lower onset voltage and input energy and to accomplishentirely uniform and stable plasma formation, and therefore, thegenerated number of hydroxyl radicals and negative ions, which sterilizeand decompose noxious gases, is increased while the generated amount ofozone, which is toxic to humans, is decreased, and power consumption isreduced.

Since entirely uniform and stable plasma formation is accomplished,decrease of the service life of the surface discharge type air cleaningdevice due to partial deterioration of the discharge electrode isprevented, and discharge safety is increased. Consequently, air cleaningefficiency is improved.

Furthermore, the discharge electrode and the ground electrode are formedon the upper and lower surfaces of the insulating dielectric body, whichis composed of a single sheet. Consequently, the structure of thesurface discharge type air cleaning device is simplified, andmanufacturing costs of the surface discharge type air cleaning deviceare reduced.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other objects, features and other advantages of thepresent invention will be more clearly understood from the followingdetailed description taken in conjunction with the accompanyingdrawings, in which:

FIG. 1 is a plan view showing a conventional surface discharge type aircleaning device;

FIG. 2 is a cross-sectional view of the conventional surface dischargetype air cleaning device seen from line A-A of FIG. 1;

FIG. 3 is a reference view illustrating plasma discharge of theconventional surface discharge type air cleaning device;

FIG. 4 is a perspective view of a surface discharge type air cleaningdevice according to a first preferred embodiment of the presentinvention showing the upper surface of the surface discharge type aircleaning device;

FIG. 5 is a perspective view of the surface discharge type air cleaningdevice according to the first preferred embodiment of the presentinvention showing the lower surface of the surface discharge type aircleaning device;

FIG. 6 is a cross-sectional view of the surface discharge type aircleaning device according to the first preferred embodiment of thepresent invention;

FIG. 7 is a longitudinal sectional view showing an indoor unit of an airconditioner, to which the surface discharge type air cleaning deviceaccording to the first preferred embodiment of the present invention isapplied;

FIG. 8 is a reference view illustrating plasma discharge of the surfacedischarge type air cleaning device according to the first preferredembodiment of the present invention;

FIG. 9 is a graph illustrating comparison in gaseous energy probabilitydistribution based on applied voltage between the surface discharge typeair cleaning device according to the first preferred embodiment of thepresent invention and the conventional surface discharge type aircleaning device;

FIG. 10 is a perspective view of a surface discharge type air cleaningdevice according to a second preferred embodiment of the presentinvention showing the upper surface of the surface discharge type aircleaning device;

FIG. 11 is a perspective view of the surface discharge type air cleaningdevice according to the second preferred embodiment of the presentinvention showing the lower surface of the surface discharge type aircleaning device;

FIG. 12 is a cross-sectional view of the surface discharge type aircleaning device according to the second preferred embodiment of thepresent invention seen from line A-A of FIG. 10.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

Now, preferred embodiments of the present invention will be described indetail with reference to the accompanying drawings.

It should be understood that surface discharge type air cleaning devicesaccording to numerous preferred embodiments of the present invention maybe proposed, although only the most preferred embodiments of the presentinvention will be described hereinafter. Also, the basic structure ofthe surface discharge type air cleaning device according to the presentinvention is identical to that of the above-described conventionalsurface discharge type air cleaning device, and therefore, a detaileddescription thereof will not be given.

A surface discharge type air cleaning device 50 according to a firstpreferred embodiment of the present invention is shown in FIGS. 4 to 6.FIG. 4 is a perspective view of the surface discharge type air cleaningdevice 50 according to the first preferred embodiment of the presentinvention showing the upper surface of the surface discharge type aircleaning device 50, FIG. 5 is a perspective view of the surfacedischarge type air cleaning device 50 according to the first preferredembodiment of the present invention showing the lower surface of thesurface discharge type air cleaning device 50, and FIG. 6 is across-sectional view of the surface discharge type air cleaning device50 according to the first preferred embodiment of the present invention.

As shown in FIGS. 4 to 6, the surface discharge type air cleaning device50 according to the first preferred embodiment of the present inventioncomprises: an insulating dielectric body 52; a discharge electrode 60formed at the upper surface of the insulating dielectric body 52; and aground electrode 70 formed at the lower surface of the insulatingdielectric body 52. The discharge electrode 60 and the ground electrode70 are protected by protective films 80 and 85 coated on the upper andlower surfaces of the insulating dielectric body 52.

The insulating dielectric body 52 is composed of a single rectangularsheet having a predetermined thickness, which is distinguished from theinsulating dielectric body of the conventional surface discharge typeair cleaning device as described above. Preferably, the insulatingdielectric body 52 is made of a resin material having high oxidizationresistance for organic matter or a ceramic material for inorganicmatter. However, the material of the insulating dielectric body 52 isnot limited to the resin material or the ceramic material, and the shapeof the insulating dielectric body 52 is not limited to the rectangularshape. The insulating dielectric body 52 may be formed of variousmaterials and shapes according to the design conditions of theinsulating dielectric body 52.

The discharge electrode 60 is formed of a pattern of a conductivemetallic material printed on the upper surface of the insulatingdielectric body 52. The pattern is formed in a rectangular closedstructure having a predetermined area.

It should be noted that the discharge electrode 60 is formed in adepressed structure, which is distinguished from the embossed structureof the discharge electrode 60 of the conventional surface discharge typeair cleaning device as shown in FIG. 1. In the depressed structure,relatively low input energy can be used.

Specifically, the discharge electrode 60 has a plurality of non-patternparts 65 disposed in the part where the pattern is formed (hereinafter,referred to as a “pattern part”). The electrode is not formed at thenon-pattern parts 65. The non-pattern parts 65 extend in thelongitudinal direction of the pattern of the discharge electrode 60while being arranged in parallel with one another. Consequently, thenon-pattern parts 65 are formed in a closed structure surrounded by thepattern part 62. In the illustrated embodiment, the number of thenon-pattern parts 65 is three, although the number of the non-patternparts 65 may be changed.

Each of the non-pattern parts 65 comprises: a linear part 66 extendingin the longitudinal direction of the pattern of the discharge electrode60; and a plurality of circular parts 67 formed on the linear part 66 ata predetermined interval, the diameter of each of the circular parts 67being greater than the width of the linear part 66. Preferably, thewidth of the linear part 66 is less than that of the pattern part 62 atopposite sides of the linear part 66.

The ground electrode 70 is formed of a pattern of a conductive metallicmaterial printed on the lower surface of the insulating dielectric body52 in the same fashion as the discharge electrode 60. Preferably, theground electrode 70 is a single rectangular pattern having a size lessthan that of the discharge electrode 60.

The protective films 80 and 85 are made of a non-conductive material.Preferably, the protective films 80 and 85 are made of a material thatis not easily deteriorated, and thus, not damaged when plasma isdischarged through the entire surface of the insulating dielectric body52. The protective films 80 and 85 are formed in the shape of rectangleshaving sizes greater than those of the discharge electrode 60 and theground electrode 70, respectively. The protective films 80 and 85 areapplied to the upper and lower surfaces of the insulating dielectricbody 52.

The protective films 80 and 85 have partially-opened structures suchthat the discharge electrode 60 and the ground electrode 70 are providedwith terminal parts 68 and 72, which are connected to an externalcircuit, respectively.

Preferably, the power source applied through the terminal part 68 of thedischarge electrode 60 and the terminal part 72 of the ground electrode70 is an alternating current power source.

Now, the operation of the surface discharge type air cleansing device 50with the above-stated construction according to the first preferredembodiment of the present invention will be described.

FIG. 7 is a longitudinal sectional view showing an indoor unit 91 of anair conditioner, to which the surface discharge type air cleaning device50 according to the first preferred embodiment of the present inventionis applied.

Generally, the indoor unit 91 of the air conditioner is provided with aninlet port 92 and an outlet port 93, through which indoor air iscirculated. In the indoor unit 91 are mounted a blower 94 for forciblycirculating air and a heat exchanger 95 for performing heat exchangewith air passing through the heat exchanger 95.

The surface discharge type air cleaning device 50 according to the firstpreferred embodiment of the present invention may be disposed at anyposition on an air channel in the indoor unit. Preferably, the surfacedischarge type air cleaning device 50 is disposed inside the inlet port92. The surface discharge type air cleaning device 50 is formed in theshape of a sheet, and therefore, the surface discharge type air cleaningdevice 50 is preferably disposed in parallel with the air flow directionsuch that flow resistance is minimized.

In the illustrated embodiment, only one surface discharge type aircleaning device 50 is mounted in the indoor unit 91, although severalsurface discharge type air cleaning devices may be mounted in the indoorunit 91 if necessary.

The operation of the surface discharge type air cleaning device 50according to the first preferred embodiment of the present inventionwill be described hereinafter under the condition that the surfacedischarge type air cleaning device 50 is mounted in the indoor unit 91as described above.

When the air conditioner is turned on to operate the blower 94, indoorair is introduced into the indoor unit 91 through the inlet port 92 andpasses through the heat exchanger. As a result, the air is cooled, andis then discharged into the interior of a room where the indoor unit 91is installed. When power source is applied to the surface discharge typeair cleaning device 50 to clean the indoor air, some of the airintroduced into the indoor unit 91 through the inlet port 92 passes bythe surface discharge type air cleaning device 50. As a result,pollutants are sterilized or decomposed, and therefore, the air iscleaned.

Referring to FIGS. 4 to 6, when the air conditioner is operated, and thepower source having voltage greater than onset voltage is applied to thedischarge electrode 60 and the ground electrode 70, a dielectricbreakdown phenomenon occurs between the discharge electrode 60 and theground electrode 70, and a plasma discharge area is formed on thesurface of the insulating dielectric body 52. At this time, a streameris formed on the surface of the insulating dielectric body 52. As aresult, a large number of high-energy electrons are generated throughthe streamer, and the high-energy electrons react with gases surroundingthe high-energy electrons due to electron collision. Consequently, asmall amount of ozone and a large number of hydroxyl radicals andnegative ions are generated.

The generated ozone, the amount of which is small, and the generatedhydroxyl radicals and negative ions, the number of which is large,oxidize and decompose pollutants, such as noxious gases, contained inthe indoor air, to clean the air.

FIG. 8 is a reference view illustrating plasma discharge of the surfacedischarge type air cleaning device 50 according to the first preferredembodiment of the present invention. The discharge electrode 60 of thesurface discharge type air cleaning device 50 according to the firstpreferred embodiment of the present invention has the pattern part 62,which is formed in the depressed structure. Consequently, electricalcharges are uniformly distributed on the entire region of the dischargeelectrode 60, and therefore, stable plasma formation is possible, andgeneration distribution of the streamer is also uniformly accomplished.

Since the generation distribution of the streamer is also uniformlyaccomplished on the surface of the insulating dielectric body 52,partial increase of thermal stress at the discharge electrode 60 iseffectively prevented. Consequently, gases surrounding the dischargeelectrode 60 are not heated, and therefore, generation of ozone, whichis toxic to humans, is reduced, and the service life of the surfacedischarge type air cleaning device is increased.

FIG. 9 is a graph illustrating comparison in gaseous energy probabilitydistribution based on applied voltage between the surface discharge typeair cleaning device 50 according to the first preferred embodiment ofthe present invention and the conventional surface discharge type aircleaning device. As can be seen from FIG. 9, the surface discharge typeair cleaning device 50 can accomplish discharge at lower voltage thanthe conventional surface discharge type air cleaning device.Consequently, supply of voltage lower than oxygen dissociation energy ispossible, and therefore, the generated amount of ozone is minimized. Onthe other hand, a large number of hydroxyl radicals and negative ionsare generated at the low voltage, and therefore, oxidization anddecomposition of noxious gases are smoothly carried out.

In conclusion, the surface discharge type air cleaning device 50according to the first preferred embodiment of the present invention iscapable of increasing generation of hydroxyl radicals and negative ionswhile decreasing generation of ozone, which is toxic to humans, bylowering onset voltage and input energy. Consequently, sterilization andpurification of the indoor air are carried out using the hydroxylradicals and the negative ions. Furthermore, partial increase of thermalstress is effectively prevented, and therefore, the service life of thesurface discharge type air cleaning device is increased, and dischargesafety is improved.

In the above description, the surface discharge type air cleaning device50 according to the first preferred embodiment of the present inventionis applied to the indoor unit of the air conditioner, although thesurface discharge type air cleaning device 50 may be applied to allkinds of equipment, such as various air purifiers or noxious gaspurifying apparatuses.

A surface discharge type air cleaning device 150 according to a secondpreferred embodiment of the present invention is shown in FIGS. 10 to12. FIG. 10 is a perspective view of the surface discharge type aircleaning device 150 according to the second preferred embodiment of thepresent invention showing the upper surface of the surface dischargetype air cleaning device 150, FIG. 11 is a perspective view of thesurface discharge type air cleaning device 150 according to the secondpreferred embodiment of the present invention showing the lower surfaceof the surface discharge type air cleaning device 150, and FIG. 12 is across-sectional view of the surface discharge type air cleaning device150 according to the second preferred embodiment of the presentinvention seen from line A-A of FIG. 10.

As shown in FIGS. 10 to 12, the surface discharge type air cleaningdevice 150 according to the second preferred embodiment of the presentinvention is characterized by a discharge electrode 160 formed of arectangular frame-structured pattern part 162 having a non-pattern part165 formed therein.

Specifically, the pattern part 162 of the discharge electrode 160 isformed in the shape of a rectangular frame, which extends in thelongitudinal direction of an insulating dielectric body 152. Thenon-pattern part 165, which is formed in the pattern part 162, alsoextends in the longitudinal direction.

Especially, the discharge electrode 160 has a plurality of pointed ends164, which are protruded from the inner edges of opposite sides of thepattern part 162 about the non-pattern part 165 toward each other.

The pointed ends 164 are formed in the shape of a triangle and areuniformly protruded at a predetermined interval such that electricalcharges are concentrated on the pointed ends 164 due to high voltage,and therefore, discharge is smoothly accomplished.

In the surface discharge type air cleaning device 150 with theabove-stated construction according to the second preferred embodimentof the present invention, surface discharge is carried out in thedepressed pattern structure, and therefore, voltage applied to generateplasma is lowered, and more stable plasma formation is possible.Especially, discharge is carried out at low voltage. Consequently,generation of hydroxyl radicals and negative ions is increased whilegeneration of ozone, which is toxic to humans, is decreased, andsterilization and purification of the air are carried out using thegenerated hydroxyl radicals and the negative ions.

Other components of the surface discharge type air cleaning device 150according to the second preferred embodiment of the present inventionare identical in construction to those of the surface discharge type aircleaning device 50 according to the first preferred embodiment of thepresent invention, and the surface discharge type air cleaning device150 according to the second preferred embodiment of the presentinvention is applied to the air conditioner in the same fashion as thesurface discharge type air cleaning device 50 according to the firstpreferred embodiment of the present invention. Consequently, a detaileddescription of the other components of the surface discharge type aircleaning device 150 according to the second preferred embodiment of thepresent invention will not be given.

As apparent from the above description, the surface discharge type aircleaning device according to the present invention has the followingeffects.

The pattern of the discharge electrode is formed in the depressedstructure. Consequently, it is possible to lower onset voltage and inputenergy and to accomplish entirely uniform and stable plasma formation,and therefore, the generated number of hydroxyl radicals and negativeions, which sterilize and decompose noxious gases, is increased whilethe generated amount of ozone, which is toxic to humans, is decreased,and power consumption is reduced.

Since entirely uniform and stable plasma formation is accomplished,decrease of the service life of the surface discharge type air cleaningdevice due to partial deterioration of the discharge electrode isprevented, and discharge safety is increased. Consequently, air cleaningefficiency is improved.

Furthermore, the discharge electrode and the ground electrode are formedon the upper and lower surfaces of the insulating dielectric body, whichis composed of a single sheet. Consequently, the structure of thesurface discharge type air cleaning device is simplified, andmanufacturing costs of the surface discharge type air cleaning deviceare reduced.

Although the preferred embodiments of the present invention have beendisclosed for illustrative purposes, those skilled in the art willappreciate that various modifications, additions and substitutions arepossible, without departing from the scope and spirit of the inventionas disclosed in the accompanying claims.

1. A surface discharge air cleaning device comprising: an insulatingdielectric body formed in the shape of a sheet; a discharge electrodeformed at the upper surface of the insulating dielectric body; and aground electrode formed at the lower surface of the insulatingdielectric body, wherein the discharge electrode is formed of a closedpattern having a predetermined area on the upper surface of theinsulating dielectric body, and the discharge electrode has at least onenon-pattern part disposed in a part where the pattern is formed, theelectrode being not formed at the at least one non-pattern part.
 2. Theair cleaning device as set forth in claim 1, wherein the pattern of thedischarge electrode is formed in the shape of a rectangular frame. 3.The air cleaning device as set forth in claim 1, wherein the groundelectrode is formed of a single rectangular pattern.
 4. The air cleaningdevice as set forth in claim 1, wherein the discharge electrode and theground electrode are formed in the shape of a rectangular frame, and theframe area of the pattern of the discharge electrode is greater thanthat of the pattern of the ground electrode.
 5. The air cleaning deviceas set forth in claim 1, wherein the at least one non-pattern partcomprises a plurality of non-pattern parts extending in the longitudinaldirection of the pattern of the discharge electrode while being arrangedin parallel with one another.
 6. The air cleaning device as set forth inclaim 5, wherein each of the non-pattern parts comprises: a linear partextending in the longitudinal direction of the pattern of the dischargeelectrode; and a plurality of circular parts formed on the linear partat a predetermined interval, the diameter of each of the circular partsbeing greater than the width of the linear part.
 7. The air cleaningdevice as set forth in claim 1, wherein the discharge electrode has aplurality of pointed ends, which are protruded from opposite sides ofthe pattern part about the non-pattern part toward each other.
 8. Theair cleaning device as set forth in claim 7, wherein the pointed endsare formed in the shape of a triangle and uniformly protruded at apredetermined interval.
 9. The air cleaning device as set forth in claim1, further comprising: protective films applied to the upper and lowersurfaces of the insulating dielectric body for protecting the dischargeelectrode and the ground electrode, respectively.
 10. The air cleaningdevice as set forth in claim 9, wherein the discharge electrode and theground electrode are provided with terminal parts, which are exposedoutside the protective films and connected to an external circuit,respectively.
 11. A surface discharge air cleaning device comprising: aninsulating dielectric body formed in the shape of a sheet; a dischargeelectrode formed at the upper surface of the insulating dielectric body;and a ground electrode formed at the lower surface of the insulatingdielectric body, wherein the discharge electrode is formed of a closedpattern having a predetermined area on the upper surface of theinsulating dielectric body, the discharge electrode has at least onenon-pattern part disposed in a part where the pattern is formed, theelectrode being not formed at the non-pattern part, and the at least onenon-pattern part comprises: a linear part extending in the longitudinaldirection of the pattern of the discharge electrode; and a plurality ofcircular parts formed on the linear part at a predetermined interval,the diameter of each of the circular parts being greater than the widthof the linear part.
 12. The air cleaning device as set forth in claim11, wherein the pattern of the discharge electrode is formed in theshape of a rectangular frame.
 13. The air cleaning device as set forthin claim 11, wherein the ground electrode is formed of a singlerectangular pattern.
 14. The air cleaning device as set forth in claim11, wherein the discharge electrode and the ground electrode are formedin the shape of a rectangular frame, and the frame area of the patternof the discharge electrode is greater than that of the pattern of theground electrode.
 15. The air cleaning device as set forth in claim 11,further comprising: protective films applied to the upper and lowersurfaces of the insulating dielectric body for protecting the dischargeelectrode and the ground electrode, respectively.
 16. A surfacedischarge air cleaning device comprising: an insulating dielectric bodyformed in the shape of a sheet; a discharge electrode formed at theupper surface of the insulating dielectric body; and a ground electrodeformed at the lower surface of the insulating dielectric body, whereinthe discharge electrode is formed of a closed pattern having apredetermined area on the upper surface of the insulating dielectricbody, the discharge electrode has at least one non-pattern part disposedin a part where the pattern is formed, the electrode being not formed atthe non-pattern part, and the discharge electrode has a plurality ofpointed ends, which are protruded from opposite sides of the patternpart about the non-pattern part toward each other.
 17. The air cleaningdevice as set forth in claim 16, wherein the pattern of the dischargeelectrode is formed in the shape of a rectangular frame.
 18. The aircleaning device as set forth in claim 16, wherein the ground electrodeis formed of a single rectangular pattern.
 19. The air cleaning deviceas set forth in claim 16, wherein the discharge electrode and the groundelectrode are formed in the shape of a rectangular frame, and the framearea of the pattern of the discharge electrode is greater than that ofthe pattern of the ground electrode.
 20. The air cleaning device as setforth in claim 16, further comprising: protective films applied to theupper and lower surfaces of the insulating dielectric body forprotecting the discharge electrode and the ground electrode,respectively.